Machine for cutting and dressing grindstones.



PATETED FEB. 2, 1-90'7.

. J. GRIESHABER.' v MACHINE FOR CUTTING AND DRESSING GRINDSTONES.

APPLOATION FILED H01L-3, 1905.

SN j NAN Witnesses:

No. 845,410 Y PVATNNTED NEB. 26, 1907.

A J. GNIESNABEN. N

MACHINE FON CUTTING. NND DRESSING G'NINDsToNEs.

APLIUATION FILED NV. 3, 1905.

B SHEETS-(SHEET 2.

PATENTED ma. 26, i190?.

J. GRI'ESHABER.-

MACHINE FOR CUTTING 'AND' DRESSING GRINDSON'ES.

-"APPLIOATION P ILED NOV. 3,'1905. Y

UNITED STATES PATENT OFFICE.

JOHANNES GRIESHABER, OF SCHAFFHAUSEN, SWITZERLAND.

MACE-HNE FOR CUTTlNG AND DRESSING'GRINDSTONES.

no. 645,41o.

Specification of Letters Patent.

A:Patented Feb. 2e, 1907.

Application filed November 3,1905. Serial No. 285,761.

To all, whom, t may concern:

Be it known that I, JOHANNES Gmnsna- BER, a citizenA of the Republic of Switzerland, residing at Schaiihausen, in Switzerland, have invented new and useful Improvements in Machines for Cutting or Dressing Grindstones and the Like, of which the following is a specification.

This invention has for its object a machine for dressing or cutting grindstones and the like having a freely-revoluble cutting-roller lying oppo'site the'periphery of the grind-I `stone to be cut or-dressed, which cuttingroller is adapted toshare in the' rotation of 1'; is the grindstone.y

2 are supports arranged one on each side of i .thngrndstona which supports maybe atdisplaceably vshields 3, which guides are open toward the vwhich bar 9 t op osite longitudinal tached -to the grindstone-trough, (which is not shown.) 3 are shields mounted on these supports, which shields are held together by e screw 4. Bearings "6 are mounted in slots 5- of the shields, and in these bearings a spindle 7 is displaceably and revolubly mounted,

- which spindle is provided with a handle at one end.v Parallel to this spindle a bar 9 is mounted in guides 8 of the slots 5 and a einst one longitudinal side of ghe bearings 6 press under the 10, which thereb action of s rings p ,side of the ar, which s1 e is provided with four rises'or projections y11, rmly against. the rounded ends of the?. 1 and 3. Each two risesfill guides 8, Figs. v y `A extend fromja common basis and extend uni formly in opposite-directions. l

' On the endA of the spindle 7, which isprovided with a handle and projects outside one ofthe shields 3, a revolub e arm 12 is mounted, the free end of vwhich arm rests on the har f 9 'and has on its under side a projection 13,' which engages in a suitable recess`or notch 14 in the har 9, whereby this latter may be coupled with the spindle, Figs. 13

execute a reciprocating press the `25-28 being able to Tho bor o isv providod with rows of holes 15, in which pins 16 may be inserted, which serve as stops between the shields and limit the displacement of the bar 9 and the spindle 7, Figs. 1, 8, and 4.

A sleeve or bush 17 is freely revolubly mounted between set-rings 18 on the spindle 7, and a knife or cutting-roller is clamped between a shoulder ofthe bush'and a nut 19, screwed on one end of the bush. The knife-` roller consists of two rings 20, which are pro vided with slots 21, lying in proximity to one another on their facing sides, in which slots cutters or knives 22 are inserted, the Vouter sharpened ends of which project beyond the peripheryof the ring 20 and which are held` y projections 20 are so arranged to one another and the` slots 21 in the same are so arranged that the which is displaced relative to the knives of" the other ring and also have a different pitchl toz them, Figs.- 1, 3, and 4. One ormore rings 24, Fi 3, of soft'metal-for instance, lead-are a so preferably inserted between the nut 19 and to prevent ment of the rings. y

Screw-spindles 25, and transversely therel to a shaft 26, are mounted in the shields- 3,

a mutual displace- 23, Figs. 5 and 6. The'ringsy f Y .knives 22 of one ring assume a positionf 4the two rings 20 in order to render softer thev pressing together of the rings 20 by'means of which shaft is connected with the spindles,l

by means of a pail of bevel-Wheels 27 and carries a ratchet-Wheel 28, provided with notches on its periphery. The spindles 25o are provided with nuts 29, on which links 30 are pivoted, whichare connected withy l the support-frames of the'grindstone,` (these frames not being shown in the drawings.) By turning the shaft 26 in one direction or the other, the shields '3 may be displaced by the intermediary of the wheels 27, spindles 25, nuts-29, and links 30, and thereby the spindle 7 with the knife-roller approached to or removed from the eriphery of the grind stone, the fixing of t be operatedby means ofv aset-spring 31 engaging in the notches of the wheel 28, Figs. 1 and 2. The machine hereinbefore'described works as follows:A The knife-cylinder is brought.. into the middle of the Width of the Ioo v e means of transmission stone before it is dressed by displacing the s'indle 7, and by turning the shaft 26 in thel j lrection indicated by the arrow, Fig. 1,

pressed iirmly against the periphery of thev grindstone, the basis of each two projections or rises 1l of the bar s lying' aggainstA the rounded ends of the guides E, Adig. Y. The cutting or knife roller or cylinder is setin rotation by thc rotating grinds-tone, the 'sharp ends of the separate knives penetrating.,r the stone.- The shaft 7, with the knife-roller, and also the bar 9, coupled with-the former, are then reciprocated, whereby the grindstone is dressed crosswise by the knives 22 over the Whole Width of its periphery, while the knife'- roller is prevented passing beyond the width of the stone by the contact-pins 16, and thereby the knives are prevented l'roin breaking olf the edges ol the grindstonc.

The grindstne, during its dressing by means of the knife-roller, receives a domed form on its periphery, which is obtained. in consequence of the arrangement ol' the swellings or rises 11 in the reciprocating movement of the bar 9 by the latter executing' a displacement movement relative to the rindstone, which movement of displacement 1s directed transversely to the reciprocating movement and which increases toward lthe end thereof, whereby the knife-roller, stare ing from the middle of displacement, is

Aalways pressed more and more against the grindstone, and thereby uniformly rounds oil the same from the middle of its width toward both sides, Fig. 3. By adjusting the shaft 26 after each reciprocating movement of the knife roller a deeper penetration of the knives 22 into the stone can be obtained, which operation is continued until the. stone is suitably dressed over its entire periphery. By the penetration of the knives into the grinds'tone the softer particles of the same are `loosened andremovcd, while the harder constituents project therefrom the more accordingly, whereby each separate grain is iven a greater grinding power, which is still urther increase by the rounding or domini); ofthe periphery of the grindstone.

'Il heknives 22 may, as shown separately in F ige. Sand 6, be also widened or enlarged at their outer sharpened ends.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what l claim is- 1', In a machine such as described, the combination with a dressing-tool, of mechanism to impart simultaneous axial and transverse movement to the tool during its rotation, including means movable simultaneously with said mechanism and during,` the axial movement thereof to proportion the transverse movement t0 the axial movement whereby a curved face is cut on the stone, substantially as described.

2. In a machine such described, the oombination 'with a revoliible cutter-shalt and bearings therefor, of means l'or axially moving the shaft and means operate l by the axial stantialiy as described..

sessie t for transversely and movinf the bearlngs, subil. in a machine such described, the com binalii'in with a revoluble cutter-shaft, of means to set the cutter to and from tbe stone io be dressed, means to axially slide said shalt and means connected to and slidable with the shalt to triiiisversely reciprocate tbe.

fi. in a machine such as described, an axi-4 ally-displaceable cutter-shaft and spring- 'urged bearings .movable transversely to the shalt, ol a bar coupled to and moving with said shalt, and against which the bearings are' held, said bar having suitably-shaped guideliiees, whereby the cutter shaft is transversely moved to impart the desired curvature to the scribed.

o. rl`he combination with a pair of slidablymounted shields and means to adjust them to and from the stone, oly bearings slidable in the shields, a cutter-shalt mounted in the bearings and a bnr dctacliably connected to the shalt and actingr on the bearings to move them to and from the stone being dressed durstone beiner dressed, substantially as deiiig the axial movement of the cutter, substantially iis described.

7. ln a inachiiiesucli as described, the combinatien with a cutter-shalt and 'ournals tlierelor, ol means to axially move t e shalt and a bar movablel with the shalt to imparta transverse movement lo the bearings and sli-alt, and adjustable stops in said bar to limit the axial movement olV `both shaft and bar and thereby limit the transverse movement ol the shalt, substantially as described. Syln a machine such i described, the combination with a dressing-tool and axially-4 niovable shalt, ol bearings for the shaft movable transversely to the shalt, means connected to theslialt and acting on the bearings to proportion the transverse movements ol the tool and shaft during their rotation to 'Y their axial movement and means to inde- JOE lith; fl ES GRIES IABER.

Witnesses:

Enns? liscnsn, A. Mnsnnmiscnr. 

